Cloxotestosterone (), also known as 17ò-chloral hemiacetal testosterone, is a synthetic anabolicâÂÂandrogenic steroid (AAS) and an androgen ether â specifically, the 17ò-trichloro hemiacetal ether of testosterone â which was never marketed. The O-acetate ester of cloxotestosterone, cloxotestosterone acetate (brand name Caprosem), in contrast to cloxotestosterone, has been marketed.